#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const ll N = 1e6 + 10, INF = 0x3f3f3f3f;

ll a, b, c;

ll f(ll x)
{
    ll res = 0;
    while (x) {
        res = res * 10 + x % 10;
        x /= 10;
    }
    return res;
}

void solve()
{
    cin >> a >> b;
    for (ll i = 3;i <= 10;i++) {
        c = f(a + b);
        a = b;
        b = c;
    }
    cout << c;
}

signed main()
{
    //ios::sync_with_stdio(0);
    //cin.tie(0);cout.tie(0);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    ll T = 1;
    //cin>>T;
    for (ll i = 1;i <= T;i++) {
        solve();
    }
}